Ending II with Anakin turning is a pretty interesting idea. I always wished there was a sequence where we actually saw Anakin, as Darth Vader, killing Jedi. The closest we ever get to that is the security hologram.
I like your idea for an alternate episode III as well Smithers. I think we will be getting an Obi-Wan movie (I think we’ll hear about it before the end of the year), but if for some reason it never comes to fruition, I think it would be possible to rework some material from Ewan McGregor’s film Last Days in the Desert as well.
In my ideal trilogy, we don’t even see Vader’s suit on, the third film would open with the physical transformation followed by an attack on Coruscant, there’s plenty of footage from the old republic trailer ‘Deceived’ that can be repurposed for that as well. The force unleashed 2 also has a few cutscenes where CGI Vader looks pretty good, adding some grain would make a few shots blend right in I believe.
Also, this (https://www.youtube.com/watch?time_continue=9&v=LmOPXhFensg) can be used as an Obi-Wan dream sequence where he sees the future, we still have some time to see the final result of that whole project, though.
I’m hard-pressed to believe that Disney couldn’t help but put Darth Vader scenes in the Obi-Wan movie, possibly even having them communicate using the force just like Kylo and Rey did. Just for editing purposes I hope they do tbh.